US5093187A - Tear strip - Google Patents
Tear strip Download PDFInfo
- Publication number
- US5093187A US5093187A US07/725,949 US72594991A US5093187A US 5093187 A US5093187 A US 5093187A US 72594991 A US72594991 A US 72594991A US 5093187 A US5093187 A US 5093187A
- Authority
- US
- United States
- Prior art keywords
- layer
- base
- tear strip
- polypropylene
- structure according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/022—Mechanical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
- C09J2301/162—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer the carrier being a laminate constituted by plastic layers only
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2423/00—Presence of polyolefin
- C09J2423/006—Presence of polyolefin in the substrate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2813—Heat or solvent activated or sealable
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2813—Heat or solvent activated or sealable
- Y10T428/2817—Heat sealable
- Y10T428/2826—Synthetic resin or polymer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
- Y10T428/31913—Monoolefin polymer
Definitions
- the subject of the invention is a tear strip having a supporting material which is stretched in substantially one direction and optionally is provided with an adhesive layer.
- the tear strip is suitable in particular for cardboard acticles.
- Self-adhesive or heat-reactivated tear strips of polypropylene film stretched in longitudinal direction have been used for some time for the tearing open of cardboard articles. They are offered on the one hand in film thicknesses of 60-65 ⁇ m with a tensile strength in longitudinal direction of 230-330N/mm 2 , equivalent to 55-85N/4 mm of strip width. On the other hand, on a small scale, tear strips are produced in thicknesses of 120-140 ⁇ m with a tensile strength in longitudinal direction of approximately 400N/mm 2 , equivalent to 200-225 N/4 mm of strip width.
- the polypropylene tear strips in 60-65 ⁇ m display a satisfactory tear behaviour with all corrugated cardboard articles, including micro-corrugated board. This finding applies irrespective of whether tearing is performed precisely in the direction of the adhesively affixed strip. "Precisely in the direction of the adhesively affixed strip” means that the tear strip is torn off in such a way that the direction of pulling never deviates from the direction which is specified by the tear strip affixed on the rear of the article and which becomes visible even from the front of the article during the tearing operation as a tear joint. Only then is the distribution of forces in the tear strip symmetrical during the tearing operation and the loading of both cut edges even. In practice, this ideal tear direction is usually not maintained. Deviations from this direction of up to approximately 30° must be expected.
- the polypropylene tear strips in 60-65 ⁇ m thickness are suitable in the same way both for corrugated boards and for solid boards up to a basis weight of 600 g/m 2 with kraftliner face layers applied on both sides on the paper machine irrespective of the tear direction.
- Corresponding 1000 g/m 2 solid boards can only be torn open without any problems in the optimum tear direction. If there is a deviation from this direction, owing to the unsymmetrical loading of the strip, offshooting tears started from the more highly loaded edge of the strip may occur during the tearing operation.
- the frequency of the offshooting tears is influenced for example by inhomogeneities in the film, by micronicks in the cut edges of the film strips, by small pieces of wood or particularly compacted particles in the board and similar phenomena.
- the tearing speed has an effect.
- solid boards having a basis weight of between 450 and 600 g/m 2 have been used to an increasing extent for the packaging of detergents, in some cases having a wax-impregnated intermediate layer, but in any case with a laminated-on face layer of high gloss cast-coated Chromolux® paper.
- these boards can only be torn open with the 60-65 ⁇ m thick polypropylene tear strips with a similarly poor result.
- a tear strip provided with a pressure-sensitive or heat-sealable adhesive compound which has an oriented, predominantly longitudinally stretched supporting film which is predominantly of polypropylene and ensures, with smallest possible thickness, an optimum tearing result even if the tear direction deviates from the direction of the adhesively affixed strip.
- a 4 mm wide tear strip is not extended by more than 10% under a load of 25N.
- a tear strip having a supporting base stretched in predominantly one direction, which strip is preferably provided with an adhesive layer and is characterized in that the supporting base consists of at least one base layer, which is provided with at least one tough layer, which is tougher than the base layer.
- Tough and “tougher” in this case means in particular that the additional layer is structured such that, when subjected to an impact load from which the base layer already suffers a brittle fracture, said additional layer is deformed without fracture, with high elongation and energy absorption.
- a tough layer preferably has a higher impact strength than the base layer.
- “Tough” means in particular "impact resistant”.
- a tear strip having a supporting base stretched in predominantly one direction which strip preferably is provided with an adhesive layer and is characterized in that the supporting base consists of at least one base layer, which is provided with at least one tough layer containing a toughening additive, which tough layer is tougher than the base layer, is preferred.
- “Tough” and “tougher” in this case means in particular that the additional layer is structured, by the use of suitable impact-resistant or toughening materials, such that, when subjected to an impact load from which the base layer already suffers a brittle fracture, said additional layer is deformed without fracture, with high elongation and energy absorption.
- a tear strip having a supporting base stretched in predominantly one direction, which strip preferably is provided with an adhesive layer and is characterized in that it has a supporting base of at least one polypropylene-containing base layer, which base layer is provided with at least one polypropylene-containing tough layer, which is tougher than the base layer. It is preferred that the base layer and/or the supporting base contain predominantly polypropylen.
- a tear strip having a supporting base stretched in predominantly one direction which strip is provided with an adhesive layer and is characterized in that it has a supporting base of at least one base layer containing a polypropylene-olefin copolymer and/or a polypropylene toughening additive mixture, which base layer is provided with at least one polypropylene-containing tough layer, which contains a toughening additive and is tougher than the base layer, is particularly preferred.
- the base layer or the base layers contain predominantly, preferably at least 70%, a polypropylene having a high, preferably at least 70%, isotactic proportion, in particular having approximately 95%.
- Random or else block copolymers of propylene and olefins are preferably used.
- propylene-ethylene copolymers which contain up to 20% copolymerized ethylene.
- the base layer or the base layers may contain up to 100% propylene-olefin copolymers or, admixed to these copolymers, may preferably contain up to 25% of a toughening additive. This is suitable for improving the tensile impact strength of polypropylene stretched in the web direction, in particular in the direction perpendicular thereto.
- Preferred toughening additives are linear low density polyethylene (LLDPE), thermoplastic rubber such as butadiene-styrene copolymers (SBS) or isoprene-styrene copolymers (SIS), in particular their block copolymers in each case, or ethylene-vinyl acetate copolymers (EVA).
- LLDPE linear low density polyethylene
- SBS butadiene-styrene copolymers
- SIS isoprene-styrene copolymers
- EVA ethylene-vinyl acetate copolymers
- the base layers may also contain polypropylene homopolymer, but then have a toughening additive, preferably at least 10%, a maximum by preference of 30%, admixed.
- the toughening additives are preferably added individually. Mixtures of the specified toughening additives can also be used however.
- the base layers preferably contain 75%-100% copolymer and 25%-0% LLDPE or 80%-100% copolymer with 20%-0% thermoplastic rubber, in particular SBS, or 75%-100% copolymer and 25%-0% EVA, but, particularly preferred, 80%-95% copolymer and 5%-20% LLDPE or 85%-95% copolymer and 5%-15% thermoplastic rubber, in particular SBS, or 85%-95% copolymer and 5%-15% EVA.
- a tough layer preferably contains polypropylene, in particular up to 65% propylene-olefin copolymer or 55% propylene-homopolymer, as specified for the base film, preferably at least 20% in each case, to which preferably 35% or 45%-80% of a toughening additive, in particular of the above-specified toughening additives LLDPE, thermoplastic rubbers or EVA, are added.
- the toughening additives are preferably added individually. Mixtures of the toughening additives are also possible however.
- the toughening additive effects an improvement in the tensile impact strength, in particular transversely to the main direction of stretching.
- the tough layers preferably contain 20%-50% copolymer and 80%-50% LLDPE or 50-70% copolymer and 50-30% thermoplastic rubber, in particular SBS, or 20-40% copolymer and 80%-60% EVA, but, particularly preferred, 30%-40% copolymer and 60%-70% LLDPE or 55%-65% copolymer and 35%-45% thermoplastic rubber, in particular SBS, or 25%-35% copolymer and 65%-75% EVA.
- the same individual toughening additive is preferably used in each case in base layers and the tough layers.
- the use of different individual toughening additives or the same or different mixtures of toughening additives is also possible however.
- the linear low density polyethylene is a special ethylene copolymer having a density of 0.910-0.935 g/cm 3 , copolymerized with the use of an olefin containing at least three, preferably 3-10 carbon atoms (see L. Schwiegk: "LLDPE--ein not Polyathylen” (LLDPE--A new polyethylene), Plastverarbeiter (Fabricator in plastics), 33rd year, 1982, No. 9, pages 1035-1037).
- an LLDPE having 1-octene as comonomer which has a density of approximately 0.920 g/cm 3 , is preferably used.
- a block copolymer having a styrene content of approximately 50% is preferably used as butadiene-styrene toughening additive.
- the use of similarly acting styrene-isoprene copolymers is likewise possible.
- Base layers and/or tough face layers may additionally contain smaller proportions, preferably up to 10%, in particular up to 5%, of further suitable polymers and usual additives.
- a polymer having a vinyl acetate content of 45% is preferably used as ethylene-vinyl acetate copolymer.
- the supporting material of the tear strip according to the invention is obtained by extrusion and stretching of the individual layers in at least one direction and subsequent lamination in a known way, but preferably by coextrusion of the layers into a coextruded primary film and subsequent stretching of the primary film in at least one direction using usual, generally known methods. Stretching is preferably carried out in longitudinal direction.
- the stretching ratio in the stretching of the coextruded primary film in longitudinal direction is preferably 1:5 to 1:9, 1:6.5 to 1:7.5 being particularly preferred.
- a stretching ratio of 1:6 specifies that, from a section of the film of for example 1 m in length, a section of 6 m in length of the stretched film is produced.
- Other formulations are known for the expression "web direction", for example: longitudinal direction, machine running direction. Stretching takes place without the width of the primary film being reduced substantially, only the thickness of the film being affected.
- the subject of the invention is the process for production of the tear strip according to the invention.
- the thickness of the stretched supporting film may be 50-150 ⁇ m, preferably 60-120 ⁇ m, in particular 70-100 ⁇ m.
- the proportion made up by the base layer or base layers, taken together, is 50-90%, preferably 65-75% of the total thickness of the tear strip supporting base.
- one tough layer is applied, which is then laid with particular preference on the surface of the finished tear strip not provided with adhesive, so that the bonding of the tear strip takes place via the base layer.
- two or more tough layers may be applied or coextruded on top of one another on both surfaces of the base layer.
- one or more tough layers between two or more base layers, which then may be provided with one or two tough layers on their outer lying surface.
- tear strips having five, preferably alternating, layers are obtained. Tear strips having a substantially larger number of individual layers can also be obtained.
- the tear strips according to the invention are used preferably with a strip width of 2-8 mm, preferably 3-6 mm and have a thickness of 50-150 ⁇ m in particular 60-120 ⁇ m.
- the strip is not extended by more than 10% under a load of ⁇ 20N, preferably ⁇ 25N, in particular ⁇ 35N.
- the strip width, the thickness of the strip and the stretching ratio of the film are to be wellsuited to each other accordingly.
- a pressure-sensitive or heat-sealable adhesive compound known per se, is applied to one side of the supporting film.
- the surface may be pretreated by methods usually used for polyolefin surfaces, for example by corona or flame pretreatment. Special anchorage layers may likewise be used.
- the subject of the invention is also equivalent or in a different way equipped tear strips or strips with the base to be torn open suitable joined or strips which may be joined in a suitable way.
- Preferred are all forms of the tear strip according to the invention which may be sticked or are sticked to the base to be torn open.
- the term "provided with an adhesive layer” therefore also denotes that the tear strip may be joined or is joined with the base, in particular may be sticked or is sticked to the base.
- the reverse of the supporting film, not coated with adhesive compound, is preferably provided with an adhesive-repellent release layer.
- a mixture II of 35 pbw of the above-specified polypropylene copolymer with 65 pbw of the above-specified polyethylene copolymer is likewise melted.
- the two extruders are coordinated in such a way that, by means of a "black box", a coextruded film having a total thickness of 620-650 ⁇ m and a width of approximately 1400 mm is extruded onto a chill roll via a slot die.
- the proportion of mixture I of the total thickness is approximately 450-470 ⁇ m, that of mixture II is 180-200 ⁇ m.
- This primary film is fed via preheated rolls to a roll-type drawing frame of usual design and longitudinally stretched at temperatures of 100°-135° C. at a ratio of 1:7.5.
- the film obtained has a thickness of 83-87 ⁇ m and, after edge trimming, a width of 1200 mm.
- the proportion of mixture I of the total thickness is 60-63 ⁇ m.
- the stretched complete film has, in longitudinal direction, a tensile stress at 10% elongation of 35N/4 mm, an ultimate tensile stress of 73N/4 mm and an elongation at break of 40%.
- a self-adhesive tear strip is fabricated from this film in accordance with the state of the art.
- a commercially available silicone release lacquer from the class of condensation-crosslinked two-component systems is applied to the coextrusion layer produced from mixture II.
- the release substance is applied as a 5% solution in toluene by means of a roller application unit.
- the coating thickness (dry) was 0.15 g/m 2 .
- a pressure-sensitive adhesive is applied to the corona-pretreated surface of the base layer.
- the adhesive consists of
- the adhesive is applied to the corona-pretreated film surface as 40% solution in toluene with subsequent drying.
- the adhesive application is approximately 25 g/m 2 . Application from the melt is also possible.
- the coated supporting webs are cut up on special cutting machines to 4 mm wide tear strips and wound up in the usual way to 10,000 m long large rolls.
- Example 1 As a departure from Example 1, a mixture I of 92 pbw of the polypropylene copolymer used in Example 1 and 8 parts by weight of a styrene-butadiene block copolymer having a styrene content of approximately 50% and a melt flow index (230/2.16) of 5-10 g/10 min. was used for the base layer.
- a mixture II of 60 pbw of the above-specified polypropylene copolymer and 40 pbw of the above-specified styrene-butadiene block copolymer was used.
- the two mixtures were prepared by initially mixing a mixture of 50 pbw polypropylene copolymer and 50 pbw styrene-butadiene block copolymer, extruding it as a strand and subsequently granulating it.
- the granules are then used to adjust to the above-specified mixing ratios with polypropylene copolymer, for example by mixing 80 pbw of the granules just described with 20 pbw of the polypropylene copolymer for mixture II. If the styrene-butadiene polymer is mixed in directly, an inhomogeneous distribution of this toughening additive, which is only effective when finely dispersed, is the result.
- the extrusion, film production and tear strip fabrication take place in the same way as in Example 1.
- Example 2 As a departure from Example 1, a mixture I of 88 pbw polypropylene copolymer and 12 pbw ethylene-vinyl acetate copolymer is used for the base layer.
- the ethylene-vinyl acetate copolymer has a vinyl acetate content of 45% and has, as a mixture of 40 pbw with 60 pbw Propathene GSF 113, a melt flow index 230/2.16 of 3.5-4.5 g/10 min.
- a mixture II of 35 pbw polypropylene copolymer and 65 pbw ethylene-vinyl acetate is used.
- Punched blanks form original 10 kg detergent cardboard boxes, produced from solid board with wax impregnation, laminated with a high gloss cast-coated Chromolux paper, with original printing on the paper side, total basis weight 590 g/m 2 had the 4 mm wide tear strips to be tested adhesively affixed to them over a length of 60 cm at the place also envisaged in practice. It should be pointed out at this stage that boards may display different tear behaviour in the machine direction of board production and perpendicularly thereto, so that the tear direction intended by the cardboard article producer must also be maintained for the comparative testing of the test.
- test persons were instructed not to behave cautiously but to exert their full strength.
- 100 tearing operations were evaluated. At least two versions were always mixed into one test series. At least three persons with the same number of tearing operations in each case, but at least 66, were involved in a test series. As the result, the lowest and highest failure rate in percent, found by the individual test persons, was specified for each test version. A tearing through of the tear strip during the tearing operation was evaluated as failure.
- Example A corresponds here to the base layer of Example 1 without coextruded tough layer, on the other hand in its tear behaviour also to the 60-65 ⁇ m thick tear strips available on the market.
- Examples B and C represent Example A in the thickness increased to 85 and 115 ⁇ m, respectively, and correspondingly higher values for stress at 10% elongation and ultimate tensile stress, both measured in longitudinal direction.
- Example C without coextruded tough layer
- Example C with an ultimate tensile stress which is almost twice as high as in Examples 1-3, has comparatively a completely inadequate tear behaviour, while the only 85 ⁇ m thick coextruded tear strips according to the invention pass the tear test without any failures.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Wrappers (AREA)
- Adhesive Tapes (AREA)
- Packages (AREA)
- Medicinal Preparation (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863640861 DE3640861A1 (de) | 1986-11-29 | 1986-11-29 | Aufreissstreifen |
DE3640861 | 1986-11-29 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07291810 Continuation | 1988-12-29 |
Publications (1)
Publication Number | Publication Date |
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US5093187A true US5093187A (en) | 1992-03-03 |
Family
ID=6315109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/725,949 Expired - Lifetime US5093187A (en) | 1986-11-29 | 1991-06-27 | Tear strip |
Country Status (7)
Country | Link |
---|---|
US (1) | US5093187A (de) |
EP (1) | EP0269967B1 (de) |
JP (1) | JP3031623B2 (de) |
AT (1) | ATE98161T1 (de) |
CA (1) | CA1332706C (de) |
DE (2) | DE3640861A1 (de) |
ES (1) | ES2047486T3 (de) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5466500A (en) * | 1994-02-16 | 1995-11-14 | Minnesota Mining And Manufacturing Company | Double-coated pressure-sensitive adhesive tape incorporating a strong, flexible thread |
US5552202A (en) * | 1995-07-11 | 1996-09-03 | Reynolds Consumer Products Inc. | Tear guide arrangement |
WO1998056581A1 (en) * | 1997-06-09 | 1998-12-17 | Tesa Tape Inc. | Co-extruded films, and tape products and articles of manufacture containing them |
US5882789A (en) * | 1995-06-07 | 1999-03-16 | Pechiney Recherche | Packaging material for forming an easy-opening reclosable packaging material and package |
US5882749A (en) * | 1995-06-08 | 1999-03-16 | Pechiney Recherche | Easy-opening reclosable package |
US6354739B1 (en) | 1998-05-28 | 2002-03-12 | 3M Innovative Properties Company | Tear control closing tape and container with tear control closing tape |
US6413345B1 (en) * | 1997-12-04 | 2002-07-02 | Pharmagraphics (Southeast), L.L.C. | Methods for forming a label |
US6511742B1 (en) * | 1999-11-19 | 2003-01-28 | Tesa Ag | Adhesive tape |
US6513657B2 (en) | 2001-04-26 | 2003-02-04 | 3M Innovative Properties Co. | Product packaging with handle-forming tearable tape system |
US20050048303A1 (en) * | 2003-08-29 | 2005-03-03 | Henderson Kevin O. | Multilayer films, adhesive constructions, and articles using the same |
WO2006062504A1 (en) * | 2004-12-06 | 2006-06-15 | Avery Dennison Corporation | Multilayer films, adhesive constructions, and articles using the same |
US20080020191A1 (en) * | 2006-07-21 | 2008-01-24 | Tesa Aktiengesellschaft | Monoaxially oriented polypropylene film with high transverse tear propagation resistance |
US20080085405A1 (en) * | 2006-10-06 | 2008-04-10 | Tesa Aktiengesellschaft | Adhesive tape having a carrier which is composed of one or more carrier films, the carrier bearing on at least one side an adhesive applied at least partially |
US20100055426A1 (en) * | 2006-12-21 | 2010-03-04 | Tesa Se | Multilayer adhesive tape |
US9604753B2 (en) | 2011-05-05 | 2017-03-28 | Tesa Se | Adhesive-tape system for forming a tear-open strip |
US20180305104A1 (en) * | 2017-04-19 | 2018-10-25 | Shanghai Sannian Environmental Protection Technology Company Limited | Easy-to-open Packaging Bag |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3829042A1 (de) * | 1988-08-26 | 1990-03-01 | Jacobs Suchard Gmbh | Vakuum-verpackung, verbundfolie zur herstellung einer vakuum-verpackung, vorrichtung zur herstellung der verbundfolie sowie verfahren zur herstellung von vakuum-verpackungen |
JPH0386515A (ja) * | 1989-08-30 | 1991-04-11 | Idemitsu Petrochem Co Ltd | 易裂性フィルム及びその製造方法 |
DE19846139A1 (de) * | 1998-10-07 | 2000-04-20 | Trevira Gmbh & Co Kg | Verpackter rotationssymmetrischer Körper |
DE102008005565A1 (de) | 2008-01-22 | 2009-07-23 | Tesa Ag | Folie aus Polypropylen, Verwendung derselben sowie Verfahren zur Herstellung der Folie |
DE102008058537A1 (de) | 2008-11-21 | 2010-05-27 | Tesa Se | Verwendung eines Streifen eines Klebebands zur Verstärkung von Kartonagen insbesondere im Bereich von Stanzungen und gleichzeitig als Aufreißstreifen für diese Kartonagen |
DE102011089331A1 (de) | 2011-09-16 | 2013-03-21 | Tesa Se | Klebebandsystem zur Bildung eines Aufreißstreifens |
DE102012104661B4 (de) | 2012-05-30 | 2018-03-29 | Max Frank Gmbh & Co Kg | Verfahren zum Herstellen eines Schalungsrohres aus Flachmaterial durch Spiralwickeln auf einer Sprialwickelmaschine sowie Schalungsrohr |
JP2013255884A (ja) * | 2012-06-12 | 2013-12-26 | Nippon Steel & Sumitomo Metal Corp | 磁性体選別装置 |
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Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5466500A (en) * | 1994-02-16 | 1995-11-14 | Minnesota Mining And Manufacturing Company | Double-coated pressure-sensitive adhesive tape incorporating a strong, flexible thread |
US5882789A (en) * | 1995-06-07 | 1999-03-16 | Pechiney Recherche | Packaging material for forming an easy-opening reclosable packaging material and package |
US5882749A (en) * | 1995-06-08 | 1999-03-16 | Pechiney Recherche | Easy-opening reclosable package |
US5552202A (en) * | 1995-07-11 | 1996-09-03 | Reynolds Consumer Products Inc. | Tear guide arrangement |
US5613934A (en) * | 1995-07-11 | 1997-03-25 | Reynolds Consumer Products Inc. | Method of forming a tear guide arrangement |
WO1998056581A1 (en) * | 1997-06-09 | 1998-12-17 | Tesa Tape Inc. | Co-extruded films, and tape products and articles of manufacture containing them |
US6413345B1 (en) * | 1997-12-04 | 2002-07-02 | Pharmagraphics (Southeast), L.L.C. | Methods for forming a label |
US6354739B1 (en) | 1998-05-28 | 2002-03-12 | 3M Innovative Properties Company | Tear control closing tape and container with tear control closing tape |
US6511742B1 (en) * | 1999-11-19 | 2003-01-28 | Tesa Ag | Adhesive tape |
US20030096108A1 (en) * | 1999-11-19 | 2003-05-22 | Bernhard Mussig | Adhesive tape |
US6513657B2 (en) | 2001-04-26 | 2003-02-04 | 3M Innovative Properties Co. | Product packaging with handle-forming tearable tape system |
US20050048303A1 (en) * | 2003-08-29 | 2005-03-03 | Henderson Kevin O. | Multilayer films, adhesive constructions, and articles using the same |
WO2006062504A1 (en) * | 2004-12-06 | 2006-06-15 | Avery Dennison Corporation | Multilayer films, adhesive constructions, and articles using the same |
US20080020191A1 (en) * | 2006-07-21 | 2008-01-24 | Tesa Aktiengesellschaft | Monoaxially oriented polypropylene film with high transverse tear propagation resistance |
US20080085405A1 (en) * | 2006-10-06 | 2008-04-10 | Tesa Aktiengesellschaft | Adhesive tape having a carrier which is composed of one or more carrier films, the carrier bearing on at least one side an adhesive applied at least partially |
US20100055426A1 (en) * | 2006-12-21 | 2010-03-04 | Tesa Se | Multilayer adhesive tape |
US9604753B2 (en) | 2011-05-05 | 2017-03-28 | Tesa Se | Adhesive-tape system for forming a tear-open strip |
US20180305104A1 (en) * | 2017-04-19 | 2018-10-25 | Shanghai Sannian Environmental Protection Technology Company Limited | Easy-to-open Packaging Bag |
Also Published As
Publication number | Publication date |
---|---|
EP0269967B1 (de) | 1993-12-08 |
EP0269967A3 (en) | 1989-10-11 |
EP0269967A2 (de) | 1988-06-08 |
CA1332706C (en) | 1994-10-25 |
ES2047486T3 (es) | 1994-03-01 |
ATE98161T1 (de) | 1993-12-15 |
JPS63152560A (ja) | 1988-06-25 |
DE3640861A1 (de) | 1988-06-09 |
DE3788410D1 (de) | 1994-01-20 |
JP3031623B2 (ja) | 2000-04-10 |
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